<template>
	<view>
		<search @search="gotoSearch"></search>
		<view class="scroll-view-container">
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="right-catelevel2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-lve-title">
						/{{item2.cat_name}}/
					</view>
					<!-- 当前二级分类下的三级标题 -->
					<view class="cate-lev3-list">
						<!-- 三级标题 -->
						<view class="cate-lev3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
				
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar_badge.js'
	export default {
		mixins:[badgeMix],
		data() {
			return {
				// 当前设备屏幕的高度
				wh:0,
				// 分类列表数据
				cateList:[],
				active:0,
				cateLevel2:[],
				// 切换一级标题时将右侧区域返回到最顶部
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo_screen = uni.getSystemInfoSync()
			this.wh = sysInfo_screen.windowHeight - 50
			this.getCateList()
		},
		methods:{
			activeChange(i){
				this.active = i
				
				this.cateLevel2 = this.cateList[i].children
				
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item3){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/goods_search/goods_search'
				})
			},
			
			async getCateList(){
				const {data:res} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status!==200) return uni.$showMsg()
				this.cateList = res.message

				this.cateLevel2 = res.message[0].children
				
				
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container{
		display: flex;
		.left-scroll-view{
			width: 120px;
			
			.left-scroll-view-item{
				background-color: #F7F7F7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;
				
				&.active{
					background-color: #FFF;
					position: relative;
					
					&::before{
						content: '';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						left: 0px;
						top: 50%;
						transform: translateY(-50%);
					}
				}
			}
		}
	}
	.cate-lve-title{
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	.cate-lev3-list{
		display: flex;
		flex-wrap: wrap;
		.cate-lev3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			image{
				width: 60px;
				height: 60px;
			}
			text{
				font-size: 12px;
			}
		}
	}
</style>
